Charging Rent on a Number Everyone Agreed to Follow
Index providers create the benchmarks that trillions of dollars track, then license them for a fee. Owning the yardstick the whole industry measures against turns out to be a wonderful business.
Selling the Ruler
A stock market index is, at its core, a list of companies and a rule for weighting them. It sounds like something that should be free. Yet the companies that own the major indexes run highly profitable businesses, because once an index becomes a standard that funds are built to track, the owner can charge a fee on all the money that tracks it.
Index providers create and maintain these benchmarks, and they license them to the fund companies that build products around them. Owning the yardstick the entire investment industry measures itself against is a remarkably good business, and understanding why reveals something about how standards create value.
The index itself is nearly free to produce. Its value comes entirely from everyone having agreed to use it, which is exactly what makes it impossible for a competitor to replicate.
How They Make Money
Index providers earn revenue in several ways, all flowing from ownership of a widely used benchmark.
| Revenue source | How it works |
|---|---|
| Licensing fees | Funds pay to track and name the index |
| Data subscriptions | Selling the index data and analytics |
| Fees on assets | Often a tiny share of assets tracking the index |
The most powerful is the fee tied to assets tracking the index. As more money flows into funds that track a benchmark, the provider revenue grows automatically, without any additional work, since it collects a small share of a growing pool. The rise of index investing, where investors buy funds that simply track a benchmark rather than picking stocks, has driven enormous growth in the assets tracking these indexes, and the providers have grown with them.
Why It Is So Defensible
The business is protected by a powerful moat: the network effect of a standard. Once an index becomes the accepted benchmark for a market, it is extremely hard to displace, because its value comes from everyone using it.
Funds track it because investors compare performance against it. Investors use it because it is the standard. Contracts, products, and performance measurement are all built around it. A competitor offering a technically similar index cannot easily break in, because the value is not in the index construction but in its universal acceptance, which a newcomer cannot replicate. The standard, once established, is self reinforcing and durable.
The Licensing Leverage
The provider owns the intellectual property of the index, its name and its data, and funds must license it to build a tracking product and to use the recognised name. This gives the provider real pricing power, since a fund that has built a business around tracking a specific well known index cannot easily switch to a different one without confusing investors and losing the recognition that draws them.
The dependence runs deep: a large fund tracking a famous benchmark is, in a sense, a customer that cannot leave, because its product is defined by the index it tracks. This lock in lets providers charge fees that reflect the value of the standard rather than the modest cost of maintaining the index.
The Judgement They Wield
Index providers also exercise real power through the decisions they make about index construction. Which companies are included, how they are weighted, when they are added or removed, these decisions move markets, because funds tracking the index must buy and sell to match it.
When a company is added to a major index, funds tracking it must buy the stock, creating demand; when removed, they must sell. This gives the provider influence over capital flows, and their methodology decisions, about what qualifies for inclusion, how to treat different share structures, how to define a market, carry weight far beyond an academic exercise. The provider is not just selling a benchmark but making consequential judgements that the tracking money is obliged to follow.
The Bottom Line
Index providers create the benchmarks that trillions of dollars track and license them for fees, running a highly profitable business built on owning a standard. Their revenue grows automatically as index investing grows, since they collect a share of the assets tracking their benchmarks, and their moat is the network effect of a standard that everyone uses and no competitor can replicate. They wield real market power through inclusion decisions that tracking funds must follow, making the ownership of a widely accepted index one of the more quietly valuable positions in finance.